[1] ESSCA Sch Management, Dept Mkt & Retailing, Angers, France
[2] Univ Jean Monnet, Inst Adm Entreprises St Etienne, St Etienne, France
[3] Univ Jean Monnet, St Etienne, France
[4] Univ Savoie Mont Blanc, Inst Adm Entreprises Savoie Mont Blanc, Chambery, France